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First note that 84=4x21 and 4 is a perfect square. So square root of (84)=square root (4x21)=Square root (4) Square root (21)= 2 multiplied by the square root of 21. You can also write this using rational exponents, but this is not in radical form. It is an equivalent expression, however. 2 x (21)1/2
the square root of 164= 2x the square root of 41
2 square root of 14
The square root simplifies to six times the square root of five. The decimal form of that is approximately 13.41640786
It is 9 times square root of 2